my hot tub was throwing the breaker so i unplugged the heater the hot tub stayed on then it threw a SN3 code, i unpluged the temperature sensor now SN1 code. New board installed new heater installeld, could it just be the temperature sensor cord needs replacing or could it be the pressure switch needs replacing. or all of the above and the heater as well.

When the heater was unplugged did you also unplug the sensors? Is it still tripping the breaker with new heater installed? If sensors are unplugged you will get the SN error codes. You can take an ohms reading on the heater element to see if it is shorted. Should be around 9-12 ohms on good element.

Ok so here is an update. I called and had a repairman come out. he said one of my motors needed a new impeller. So he fixed. hottub worked for a while however didn't heat. Then threw an overheat code then the SN codes and then wouldn't come one again. I unplugged the heater and it worked for a while then cut off throwing codes again. So, I then purchased another new heater thinking maybe I had a defective heater. I installed and flipped the breaker for a couple seconds and it worked. When I added water to the spa flipped the breaker now its threw a OH code then changed over to a SN3 code. Now that is all that comes up. So could it now be the temperature sensor?